Kitagawa BB200 Series Скачать руководство пользователя

Страница: 23 / 36

Shaded part additional process possible range

30°

A, B: Additional process impossible dimension.

C: Processible depth of tapping or drilling a hole.

・When gripping a work with the chuck, do not

get fingers or hands become caught. This
could cause crushed or cut fingers and hands.

This product is a device to fix a work-piece when it is processed by the lathe machine or the rotary table.
The rotary cylinder closes the jaw and fixes a work-piece so that it does not move during processing. The chuck opens
the jaw after having processed it and remove a work-piece.

5−1 Precautions during gripping work with chuck

5−2 Precautions during gripping work in irregular shape

5 . Usage

<1> Unbalance

・In the case of processing largely unbalanced work, lower the rotation speed. The work will fly out and this is

dangerous.

・Vibrations are generated if there is unbalance owing to the work or the jig, etc. Vibration not only will impart a

negative influence on the process precision but also the endurance of the chuck being remarkably shortened,
and the chuck may break. Correct the unbalance using balance weights, etc., or lower the rotation speed for use.

・Heavy cutting at high rotation speed easily generates vibration in the same manner as chuck unbalance,

therefore, set cutting conditions appropriate for the dynamic gripping force and machine rigidity.

<2> Interference, contact, impact

・Before starting work, check that the top jaw, locator, work, etc., and the tool and the tool post, etc., do not

interfere at low rotation and then start processing.

・Do not allow anything to impact the chuck, jaw, and the work. The chuck will break and this is dangerous as the

chuck and work will fly out.

・If the tool and the tool post contact the chuck or the work due to malfunction or tape mistake, etc., and impact is

given, immediately stop the rotation, and check that there are no abnormalities in the top jaw, master jaw, T nut
and bolts of each part, etc.

<3> Coolant

・Unless coolant with a rust preventive effect is used, rust will occur inside the chuck and gripping force drop

may result. The work will fly out due to the gripping force drop and this is dangerous.

5−4 Precautions related to processing

5−5 Attachment of locator and jig

・If a work in an irregular shape is gripped the master jaw may be broken. Consult our company or the distributor if

there is any concern.

・Cast metal, pitched shape or taper shape cannot be gripped.
・If the protrusion of the work is long, support it with a center or the steady rest. If the protrusion is long the tip of

the work turns, and this is dangerous as the work will fly out.

5−3 Precautions related to usage of jaw

・If a soft jaw other than one made by Kitagawa Corporation is used, the engagement will be inferior, and the

master jaw will be deformed, the gripping precision will worsen, and the work will fly out due to gripping failure,
which is dangerous.

・Do not use a top jaw with a different serration pitch from the master jaw. The engagement of the crests of the

serration will become insufficient, therefore, the serration crests will break when gripping the work, and this is
dangerous as the jaw and work will fly out.

・Do not use the soft jaw by welding to join for extension. The jaw will break due to insufficient strength and the

serration part will become distorted due to welding. As a result, the engagement will worsen, the serration crests
will break, and this is dangerous as the work will fly out.

・The chuck can be modified only in the manufacturer permissible range. This will not only break the chuck but the

chuck and work may fly out, which is dangerous.

・Provide a countermeasure against flying out (dwell pin, etc.) due to centrifugal force to the locator or the jig, and

attach with bolts which have sufficient strength. The locator or the jig may fly out, and this is dangerous.

・When replacing the top jaw, carefully clean the serration part with the master jaw, and the engagement part of

the T nut. Failure to do this may cause a precision failure.

・Set the hydraulic pressure according to the shape of the work and the cutting conditions. Pipe shape work, etc.,

may be distorted if they are tightened at a high gripping force.

・In the case of attaching the locator and the jig on the chuck body surface, tap or drill a hole in the additional process
range specified in Fig. 12.

Type

A (mm)

BB206
BB208
BB210
BB212

30
33
36
42

B (mm)

C (mm)

54.5
69
79.5
94.5

20 less
20 less
20 less
30 less

Fig.12

Table 5

NOTICE

DANGER